﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace WFTest
{
   class DBHelper
    {
        
        private static SqlCommand cmd = null;  
        private static SqlDataReader sdr = null;

        static SqlConnection sqlcon = new SqlConnection(ConfigurationManager.ConnectionStrings["con1"].ConnectionString);


        private static SqlConnection GetConn()
       {  
            if (sqlcon.State == ConnectionState.Closed)  
            {
                sqlcon.Open();  
            }  
            return sqlcon;  
        }

        /// <summary>  
        ///  执行不带参数的增删改SQL语句或存储过程  
        /// </summary>  
        /// <param name="cmdText">增删改SQL语句或存储过程</param>  
        /// <param name="ct">命令类型</param>  
        /// <returns></returns>  
      public static int ExecuteNonQuery(string cmdText, CommandType ct)
        {  
            int res;  
            try  
            {  
                cmd = new SqlCommand(cmdText, GetConn());  
                cmd.CommandType = ct;  
                res = cmd.ExecuteNonQuery();  
            }  
            catch (Exception ex)  
            {  
                throw ex;  
            }  
            finally  
            {  
                if (sqlcon.State == ConnectionState.Open)  
                {
                    sqlcon.Close();  
                }  
           }  
            return res;  
       }  
  
        /// <summary>  
        ///  执行带参数的增删改SQL语句或存储过程  
        /// </summary>  
        /// <param name="cmdText">增删改SQL语句或存储过程</param>  
        /// <param name="ct">命令类型</param>  
        /// <returns>int值</returns>  
        public static int ExecuteNonQuery(string cmdText, SqlParameter[] paras, CommandType ct)
        {  
            int res;  
            using (cmd = new SqlCommand(cmdText, GetConn()))  
            {  
                cmd.CommandType = ct;  
               cmd.Parameters.AddRange(paras);  
                res = cmd.ExecuteNonQuery();  
            }  
            return res;  
        }  
  
        /// <summary>  
        ///  执行查询SQL语句或存储过程  
        /// </summary>  
        /// <param name="cmdText">查询SQL语句或存储过程</param>  
        /// <param name="ct">命令类型</param>  
        /// <returns>Table值</returns>  
        public static DataTable ExecuteQuery(string cmdText, CommandType ct)
        {  
            DataTable dt = new DataTable();  
            cmd = new SqlCommand(cmdText, GetConn());  
            cmd.CommandType = ct;  
            using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))  
            {  
                dt.Load(sdr);  
            }  
            return dt;  
        }  
  
        /// <summary>  
        ///  执行带参数的查询SQL语句或存储过程  
        /// </summary>  
        /// <param name="cmdText">查询SQL语句或存储过程</param>  
        /// <param name="paras">参数集合</param>  
        /// <param name="ct">命令类型</param>  
        /// <returns>Table值</returns>  
        public static DataTable ExecuteQuery(string cmdText, SqlParameter[] paras, CommandType ct)
        {  
            DataTable dt = new DataTable();  
            cmd = new SqlCommand(cmdText, GetConn());  
            cmd.CommandType = ct;  
            cmd.Parameters.AddRange(paras);  
            using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))  
            {  
                dt.Load(sdr);  
            }  
            return dt;  
        }  
  
 
        /// <summary>  
        /// 执行带参数的Scalar查询  
        /// </summary>  
        /// <param name="cmdText">查询SQL语句或存储过程</param>  
        /// <param name="paras">参数集合</param>  
        /// <param name="ct">命令类型</param>  
        /// <returns>一个int型值</returns>  
        public static int ExecuteCheck(string cmdText, SqlParameter[] paras, CommandType ct)
        {  
            int result;  
            using (cmd = new SqlCommand(cmdText, GetConn()))  
            {  
                cmd.CommandType = ct;  
                cmd.Parameters.AddRange(paras);  
                result = Convert.ToInt32(cmd.ExecuteScalar());  
            }  
            return result;  
        }  
    }  
}  


   
